X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/d669751ba187834ccc6e4fc44b070159d34b1c2b..a176a0794da2ffb2025076c0ec0e9e6750a560a6:/apt-pkg/contrib/cdromutl.cc?ds=sidebyside diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc index 58dff94d2..6f00e1451 100644 --- a/apt-pkg/contrib/cdromutl.cc +++ b/apt-pkg/contrib/cdromutl.cc @@ -1,6 +1,6 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: cdromutl.cc,v 1.1 1998/11/29 01:19:27 jgg Exp $ +// $Id: cdromutl.cc,v 1.12 2001/02/20 07:03:17 jgg Exp $ /* ###################################################################### CDROM Utilities - Some functions to manipulate CDROM mounts. @@ -10,63 +10,89 @@ ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ -#ifdef __GNUG__ -#pragma implementation "apt-pkg/cdromutl.h" -#endif #include #include #include #include +#include +#include + #include #include -#include +#include #include #include +#include #include #include /*}}}*/ +// IsMounted - Returns true if the mount point is mounted /*{{{*/ +// --------------------------------------------------------------------- +/* This is a simple algorithm that should always work, we stat the mount point + and the '..' file in the mount point and see if they are on the same device. + By definition if they are the same then it is not mounted. This should + account for symlinked mount points as well. */ +bool IsMounted(string &Path) +{ + if (Path.empty() == true) + return false; + + // Need that trailing slash for directories + if (Path[Path.length() - 1] != '/') + Path += '/'; + + /* First we check if the path is actualy mounted, we do this by + stating the path and the previous directory (carefull of links!) + and comparing their device fields. */ + struct stat Buf,Buf2; + if (stat(Path.c_str(),&Buf) != 0 || + stat((Path + "../").c_str(),&Buf2) != 0) + return _error->Errno("stat",_("Unable to stat the mount point %s"),Path.c_str()); + + if (Buf.st_dev == Buf2.st_dev) + return false; + return true; +} + /*}}}*/ // UnmountCdrom - Unmount a cdrom /*{{{*/ // --------------------------------------------------------------------- /* Forking umount works much better than the umount syscall which can leave /etc/mtab inconsitant. We drop all messages this produces. */ bool UnmountCdrom(string Path) { - int Child = fork(); - if (Child < -1) - return _error->Errno("fork","Failed to fork"); + if (IsMounted(Path) == false) + return true; + + int Child = ExecFork(); // The child if (Child == 0) { // Make all the fds /dev/null - for (int I = 0; I != 10; I++) - close(I); for (int I = 0; I != 3; I++) dup2(open("/dev/null",O_RDWR),I); - const char *Args[10]; - Args[0] = "umount"; - Args[1] = Path.c_str(); - Args[2] = 0; - execvp(Args[0],(char **)Args); - exit(100); + if (_config->Exists("Acquire::cdrom::"+Path+"::UMount") == true) + { + if (system(_config->Find("Acquire::cdrom::"+Path+"::UMount").c_str()) != 0) + _exit(100); + _exit(0); + } + else + { + const char *Args[10]; + Args[0] = "umount"; + Args[1] = Path.c_str(); + Args[2] = 0; + execvp(Args[0],(char **)Args); + _exit(100); + } } // Wait for mount - int Status = 0; - while (waitpid(Child,&Status,0) != Child) - { - if (errno == EINTR) - continue; - return _error->Errno("waitpid","Couldn't wait for subprocess"); - } - - // Check for an error code. - if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0) - return false; - return true; + return ExecWait(Child,"umount",true); } /*}}}*/ // MountCdrom - Mount a cdrom /*{{{*/ @@ -74,59 +100,58 @@ bool UnmountCdrom(string Path) /* We fork mount and drop all messages */ bool MountCdrom(string Path) { - int Child = fork(); - if (Child < -1) - return _error->Errno("fork","Failed to fork"); + if (IsMounted(Path) == true) + return true; + + int Child = ExecFork(); // The child if (Child == 0) { // Make all the fds /dev/null - for (int I = 0; I != 10; I++) - close(I); for (int I = 0; I != 3; I++) dup2(open("/dev/null",O_RDWR),I); - const char *Args[10]; - Args[0] = "mount"; - Args[1] = Path.c_str(); - Args[2] = 0; - execvp(Args[0],(char **)Args); - exit(100); + if (_config->Exists("Acquire::cdrom::"+Path+"::Mount") == true) + { + if (system(_config->Find("Acquire::cdrom::"+Path+"::Mount").c_str()) != 0) + _exit(100); + _exit(0); + } + else + { + const char *Args[10]; + Args[0] = "mount"; + Args[1] = Path.c_str(); + Args[2] = 0; + execvp(Args[0],(char **)Args); + _exit(100); + } } // Wait for mount - int Status = 0; - while (waitpid(Child,&Status,0) != Child) - { - if (errno == EINTR) - continue; - return _error->Errno("waitpid","Couldn't wait for subprocess"); - } - - // Check for an error code. - if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0) - return false; - return true; + return ExecWait(Child,"mount",true); } /*}}}*/ // IdentCdrom - Generate a unique string for this CD /*{{{*/ // --------------------------------------------------------------------- /* We convert everything we hash into a string, this prevents byte size/order from effecting the outcome. */ -bool IdentCdrom(string CD,string &Res) +bool IdentCdrom(string CD,string &Res,unsigned int Version) { MD5Summation Hash; string StartDir = SafeGetCWD(); if (chdir(CD.c_str()) != 0) - return _error->Errno("chdir","Unable to change to %s",CD.c_str()); + return _error->Errno("chdir",_("Unable to change to %s"),CD.c_str()); DIR *D = opendir("."); if (D == 0) - return _error->Errno("opendir","Unable to read %s",CD.c_str()); + return _error->Errno("opendir",_("Unable to read %s"),CD.c_str()); - // Run over the directory + /* Run over the directory, we assume that the reader order will never + change as the media is read-only. In theory if the kernel did + some sort of wacked caching this might not be true.. */ char S[300]; for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D)) { @@ -134,8 +159,19 @@ bool IdentCdrom(string CD,string &Res) if (strcmp(Dir->d_name,".") == 0 || strcmp(Dir->d_name,"..") == 0) continue; - - sprintf(S,"%lu",Dir->d_ino); + + if (Version <= 1) + { + sprintf(S,"%lu",(unsigned long)Dir->d_ino); + } + else + { + struct stat Buf; + if (stat(Dir->d_name,&Buf) != 0) + continue; + sprintf(S,"%lu",(unsigned long)Buf.st_mtime); + } + Hash.Add(S); Hash.Add(Dir->d_name); }; @@ -144,14 +180,22 @@ bool IdentCdrom(string CD,string &Res) closedir(D); // Some stats from the fsys - struct statfs Buf; - if (statfs(CD.c_str(),&Buf) != 0) - return _error->Errno("statfs","Failed to stat the cdrom"); - - sprintf(S,"%u %u",Buf.f_blocks,Buf.f_bfree); - Hash.Add(S); + if (_config->FindB("Debug::identcdrom",false) == false) + { + struct statvfs Buf; + if (statvfs(CD.c_str(),&Buf) != 0) + return _error->Errno("statfs",_("Failed to stat the cdrom")); + + // We use a kilobyte block size to advoid overflow + sprintf(S,"%lu %lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)), + (long)(Buf.f_bfree*(Buf.f_bsize/1024))); + Hash.Add(S); + sprintf(S,"-%u",Version); + } + else + sprintf(S,"-%u.debug",Version); - Res = Hash.Result().Value(); + Res = Hash.Result().Value() + S; return true; } /*}}}*/